does what it should. Use it in a mine that runs 24/7 to meet low power requirements and run a 10.5 cu ft refrigerator. I've just started using it and haven't measured its performance, but everything it connects to works as it should, so I have to conclude that it does what it's supposed to. I also have a reliable 2kW inverter which I have rarely used as a backup to my main inverter which has worked fine.